1
Press the Ctrl Key on your keyboard when you open Excel to run Excel in Safe Mode.
If Excel opens correctly in Safe Mode, check the Add-ins loading with Excel, they may be causing the problem.
2
If that was not the problem, the best option is perform a full repair of your Office installation.
Open the Settings App (gear icon on your Start Menu)
Go to Apps, then scroll down to find Microsoft Office
Select that and choose Modify - Online Repair
That should fix any issues with your Office Installation.
3
If that does not resolve the problem, completely uninstall Office, restart your PC, then download and install the latest version of Office from your Microsoft account online.